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BEGIN:VEVENT
UID:1-358@lptms.universite-paris-saclay.fr
DTSTART:20150520T143000Z
DTEND:20150520T153000Z
DTSTAMP:20150511T070850Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-excepti
 onnel-du-lptms-daniel-cabra/
SUMMARY:Séminaire exceptionnel du LPTMS : Daniel Cabra - LPTMS\, salle 201
 \, 2ème étage\, Bât 100\, Campus d'Orsay - 20 Mai 15 14:30
DESCRIPTION:Skyrmion Lattices in Antiferromagnetic Systems\nDaniel C. Cabra
   (University of La Plata)\nOrdering of the frustrated classical Heisenbe
 rg model with Dzyaloshinskii-Moriya (DM) interactions on the antiferromagn
 etic triangular lattice is studied under a magnetic field by means of semi
 classical calculations and large-scale Monte Carlo simulations. We show th
 at even a small DM interaction induces the formation of anAntiferromagneti
 cSkyrmion crystal (AF-SkX) state. Unlike what is observed in ferromagnetic
  materials\, we show that the AF-SkX state consists of three interpenetrat
 ing usual Skyrmion crystals (one by sublattice)\, and most importantly\, t
 he AF-SkX state survives in the limit of zero temperature. To characterize
  the phase diagram we compute the average of the topological order paramet
 er\, the chirality\, which measures the numberof Skyrmions. As themagnetic
 fieldincreases\, this parameter presents a series of discrete jumps that m
 ay indicate transitions between different topological states. Increasing t
 he magnetic field the model exhibits a first-order transition from a spira
 l phase into a three-sublattice Skyrmion structure where multiple Bragg pe
 aks coexist in the spin structure factor.
CATEGORIES:seminars
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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